US3593330A - Web-like spring support for magnetic transducer - Google Patents

Web-like spring support for magnetic transducer Download PDF

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Publication number
US3593330A
US3593330A US794144*A US3593330DA US3593330A US 3593330 A US3593330 A US 3593330A US 3593330D A US3593330D A US 3593330DA US 3593330 A US3593330 A US 3593330A
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United States
Prior art keywords
section
spring
transducer
bridge portions
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US794144*A
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English (en)
Inventor
Donald M Ackley
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Computer Communications Inc
Original Assignee
Computer Communications Inc
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Filing date
Publication date
Application filed by Computer Communications Inc filed Critical Computer Communications Inc
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Publication of US3593330A publication Critical patent/US3593330A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/16—Supporting the heads; Supporting the sockets for plug-in heads
    • G11B21/20—Supporting the heads; Supporting the sockets for plug-in heads while the head is in operative position but stationary or permitting minor movements to follow irregularities in surface of record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/4806—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
    • G11B5/4826—Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following

Definitions

  • a magnetic transducer which operates in conjunction with a magnetic memory disc is resiliently supported in a pair of weblike springs. The transducer is attached to the springs at the opposite ends thereof for motion along an axis perpendicular to the surface of the magnetic memory disc.
  • This invention relates to magnetic memory devices and more particularly to a spring support for a magnetic transducer assembly used in such a device.
  • magnetic memories are commonly used, having a rotatable magnetic memory disc operating in conjunction with magnetic memory transducers fixed in position proximate to the disc.
  • digital or analog signals may be recorded into the disc by appropriately energizing the magnetic transducer, or conversely, digital or analog signals recorded on the memory disc can be read out through the transducer.
  • Due to the relatively low level of the magnetic signals stored on the disc it is essential that the transducers be placed very closely proximate thereto, in some instances being continually in contact therewith and in others being separated therefrom by a thin film of air, with physical contact between the disc and the transducer occasionally occurring.
  • the transducer is generally mounted on the end of a spring in the form of an arm which extends from a fixed mount.
  • the spring arm moves along an are as the transducer receives impetus from the surface of the disc, i.e., as the surface impels the transducer with its rotation due to surface imperfections, slight surface warpage, and the like.
  • the spring arm of the prior art forms the radius of a circle, and rather than moving in directions perpendicular to the surface of the disc, moves along an arc.
  • the device of this invention overcomes the shortcomings of the above-mentioned prior art spring supports by providing a pair of weblike spring members between which the transducer is supported, the transducer in this support moving along an axis normal to the surface of the disc in response to impetus from the disc surface, and therefore does not read or record a pulse radially displaced from its true clock position.
  • the unique spring support of this invention not only avoids arcuate motion but also resists twisting motion which would also tend to cause signal distortions.
  • FIG. 1 is a plan view illustrating a bank of magnetic transducers utilizing the spring supports of the device of the invention, as installed in a magnetic disc memory,
  • FIG. 2 is a perspective view illustrating the bank of transducers shown in FIG. 1,
  • FIG. 3 is a cross-sectional view taken along the plane indicated by 3-3 in FIG. 2, and
  • FIG. 4 is a top plan view illustrating a preferred embodiment of the device of the invention.
  • the device of the invention comprises a pair of flat weblike spring elements between which a magnetic transducer is resiliently supported.
  • Each weblike spring element has a central section which has the form of a flat strip and which is joined to a second section in the form of an endless band, which is externally concentric therewith, by bridge portions.
  • the second section in turn is joined by bridge portions to a third section, which is in the form of an endless band and is externally concentric with the first and second sections.
  • the third section of the weblike structure is in turn joined to a support structure.
  • the bridge portions linking the first section to the second section are located along a first axis, and the bridge portions linking the second section to the third section are located along a second axis normal to the first.
  • the transducer is supported between the central sections of an oppositely positioned pair of spring elements.
  • Magnetic transducer bank 11 as more clearly shown in FIGS. 2 and 3, and as to be explained more fully in connection with these figures, comprises a holder unit I4 which has a plurality of magnetic transducers l5 resiliently supported therein between pairs of weblike spring elements 16 (see FIG. 3).
  • the magnetic memory disc 17 is rotated, as indicated by arrow 18, past transducers 15, the magnetically sensitive surface 170 of the disc brushing past transducers 15. Magnetic signals are thus either recorded onto the disc from the transducer or read by the transducers from the disc, as the case may be.
  • This general type of magnetic memory device is well known in the art and therefore need not be described in detail here, the invention relating solely to the spring supports for the magnetic transducers.
  • the magnetic transducers 15 are each supported between a pair of oppositely positioned spring elements I6, as best shown in FIG. 3. One end of the transducer is held in the central section 16a of one of the pair of spring elements while the opposite end I5! of the transducer is held in the central section of the other spring element.
  • the transducer is held to the spring elements by means of plastic portions 19 which are molded to the core and retained in central sections 160.
  • Spring elements I6 are connected to frame 20 at the ends Md and 16 thereof. Spring elements 16 and frame 20 may be integrally formed from a strip of resilient metal.
  • Frame 20 is fixedly attached to plate 21 as for example by welding, plate 21 in turn being fixedly supported in holder I4.
  • Spring elements 16 are fabricated of a highly resilient nonmagnetic material such as beryllium copper or stainless steel. wh e holder 14 is fabricated of either a dielectric material such as a suitable plastic or a metallic material such as aluminum.
  • the spring elements 16 are flat and have a weblike structure which is formed by a plurality of concentric flat coplanar spring sections 16a, 16b and 16c.
  • Spring section is in the form of an elongated strip and, as already noted, has magnetic transducer 15 attached thereto.
  • Central spring section 16a is connected to spring section 161'; by a pair of bridge portions 22, these bridge portions being placed at opposite ends of the spring section along a common axis.
  • Spring section 16b is in the form of an oblong endless band which surrounds section 160.
  • Spring section 16b in turn is joined to spring section [6c by oppositely positioned bridge portions 24, which lie along a common axis, such axis being normal to the axis on which bridge portions 22 lie.
  • Spring section Me is similar in configu ration to spring section 16b, forming an oblong endless band which surrounds section 16b.
  • the magnetic transducer 15 is thus resiliently supported between a pair of spring elements 16 in a manner which only permits motion normal to the surface 17a of the magnetic disc when the disc provides an impetus to the transducer. In this manner, signal distortions due to sidewise or arcuate motion of the transducer are minimized.
  • the spring device of this invention can also be utilized to equal advantage to resiliently support a member for linear motion in satisfying application requirements other than that described herein, such as in a radial direction to position a transducer over or on another track for recording or reading.
  • a spring device for resiliently supporting a member for motion along a single axis comprising:
  • each of said elements including:
  • a second spring section in the form of an endless band surrounding said first section and in concentricity therewith,
  • a third spring section in the form of an endless band surrounding said second section and in concentricity therewith,
  • said pair of spring elements being positioned with their broad surfaces opposite each other in spaced relationship with said member being connected between the central sections of said elements, the broad surfaces of said spring elements being substantially normal to the single axis of motion.
  • the device of claim I wherein said means for supporting said third spring section comprises a support frame and bridge portions interconnecting said third section and said frame.
  • the device of claim I wherein the bridge portions joining said second section to said first section lie along a first axis and the bridge portions joining said third spring section to said second spring section lie along a second axis normal to said first axis 4.
  • said member is a magnetic transducer, one end of said transducer being attached to one of said spring elements, the other end of said transducer being attached to the other of said spring elements.
  • a magnetic memory device including a magnetic transducer and a memory disc which is driven past said transducer, the improvement comprising a pair of flat weblike spring elements spaced with their broad surfaces in opposing relationship l'or resiliently supporting the transducer for motion normal to the surface of the disc, each said spring element includmg:
  • a second spring section in the form of an endless band surrounding said central section and in concentricity therewith,
  • a third spring section in the form of an endless band surrounding said second section and in concentricity therewith,
  • transducer being held between the central sections of said pair of elements for motion solely along a single axis substantially normal to the surface of the disc
  • said supporting means comprises a holder, a frame attached to said holder and bridge portions interconnecting said frame and said third section.
  • bridge portions joining said second section to said first section include a pair of bridge portions which lie along a first axis and the bridge portions joining said second section to said third section comprise a pair of bridge portions which lie along a second axis normal to said first axis.

Landscapes

  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Springs (AREA)
US794144*A 1969-01-27 1969-01-27 Web-like spring support for magnetic transducer Expired - Lifetime US3593330A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US79414469A 1969-01-27 1969-01-27

Publications (1)

Publication Number Publication Date
US3593330A true US3593330A (en) 1971-07-13

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ID=25161837

Family Applications (1)

Application Number Title Priority Date Filing Date
US794144*A Expired - Lifetime US3593330A (en) 1969-01-27 1969-01-27 Web-like spring support for magnetic transducer

Country Status (4)

Country Link
US (1) US3593330A (enExample)
DE (1) DE2003372A1 (enExample)
FR (1) FR2029476A1 (enExample)
GB (1) GB1234916A (enExample)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058843A (en) * 1975-07-03 1977-11-15 Burroughs Corporation Head and gimbal assembly
US4245267A (en) * 1979-06-01 1981-01-13 New World Computer Company, Inc. Suspension device for magnetic transducers
US4305102A (en) * 1979-01-05 1981-12-08 Mitsubishi Denki Kabushiki Kaisha Multi-channel head device and its manufacturing method
US4435736A (en) 1979-06-01 1984-03-06 New World Computer Company, Inc. Isolated multiple core magnetic transducer assembly
US5079659A (en) * 1990-07-06 1992-01-07 Seagate Technology, Inc. Gimbal for supporting a hydrodynamic air bearing slider

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0155746B1 (en) * 1984-01-26 1988-03-30 Memorex Corporation Arch flexure for winchester sliders
JPS63155457A (ja) * 1986-12-19 1988-06-28 Citizen Watch Co Ltd 磁気ヘツド支持機構

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310792A (en) * 1963-05-20 1967-03-21 Burroughs Corp Magnetic head mount apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310792A (en) * 1963-05-20 1967-03-21 Burroughs Corp Magnetic head mount apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058843A (en) * 1975-07-03 1977-11-15 Burroughs Corporation Head and gimbal assembly
US4305102A (en) * 1979-01-05 1981-12-08 Mitsubishi Denki Kabushiki Kaisha Multi-channel head device and its manufacturing method
US4245267A (en) * 1979-06-01 1981-01-13 New World Computer Company, Inc. Suspension device for magnetic transducers
US4435736A (en) 1979-06-01 1984-03-06 New World Computer Company, Inc. Isolated multiple core magnetic transducer assembly
US5079659A (en) * 1990-07-06 1992-01-07 Seagate Technology, Inc. Gimbal for supporting a hydrodynamic air bearing slider

Also Published As

Publication number Publication date
GB1234916A (en) 1971-06-09
DE2003372A1 (de) 1970-12-23
FR2029476A1 (enExample) 1970-10-23

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